646617358356583 has 2 divisors, whose sum is σ = 646617358356584. Its totient is φ = 646617358356582.

The previous prime is 646617358356467. The next prime is 646617358356617. The reversal of 646617358356583 is 385653853716646.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 646617358356583 - 2²⁵ = 646617324802151 is a prime.

It is a super-2 number, since 2×646617358356583² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (646617158356583) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 323308679178291 + 323308679178292.

It is an arithmetic number, because the mean of its divisors is an integer number (323308679178292).

Almost surely, 2^{646617358356583} is an apocalyptic number.

646617358356583 is a deficient number, since it is larger than the sum of its proper divisors (1).

646617358356583 is an equidigital number, since it uses as much as digits as its factorization.

646617358356583 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 7838208000, while the sum is 76.

The spelling of 646617358356583 in words is "six hundred forty-six trillion, six hundred seventeen billion, three hundred fifty-eight million, three hundred fifty-six thousand, five hundred eighty-three".